From: Gary Quinn (Gary++at++tees.ac.uk)
Date: 03/22/2000 01:49:00
Hi Eric.
Thanks for your reply.
I'm not doing stereo. I am using a 13W3->13W3+2BNC,
but I've tried both H and V - neither worked.
When pipe zero crashed, it looked like the bitmap was
confused. Things were being drawn but scan lines were
mixed in places where they shouldn't have been - I guess
it could have been either a bitmap problem, or a sync
type problem. It took out pipe 2 as well as pipe0, but
2 just went blank.
It took me about an hour to recover - after several
failed soft attempts (reboot, reload cmb files, etc).
Oh well.
I think my next attempt - when the machine is free for
an hour, will be to tee off the green from channel zero
onto the genlock in on pipe 1.
The sync on pipe 0 is set to internal, pipes 1 and 2 are
external. I'm using 1280x1024_60.vfo
Do I have to connect anything to the genlock BNCs on pipe zero ?
I'll have a read of your email to Oliver.
Cheers,
Gary.
Eric Kunze wrote:
>
> Hi Gary,
>
> You might want to check with the references I just sent Oliver, they may
> help double check your cabling, etc.
>
> If you are running stereo, then you actually need to have the sync output
> set to horizontal. IR stereo formats have a special csync output on the hsync
> in order to allow field matched genlock. There were some reasons why it
> couldn't go on Composite having to do with monitor compatibility. The net
> result is that for stereo formats, you need to have the sync output set to
> Horizontal instead of composite for IR. ircombine knows this and will auto
> select horizontal as your sync output when a stereo format is selected.
>
> Also, f you are using one of the SGI 13w3->13w3+2BNC cables that break out H
> and V sync from an Onyx2, you might want to check the cable. The early models
> of this cable had the H and V connectors mismarked (H is V and V is H). You
> can tell if you have this problem by looking at the part number on the cable.
> If it ends in -001, then it is the old(reversed) cable. The -002 cables have H
> and V properly marked.
>
> Otherwise, make sure your sync setting is external, with sync format
> correctly set in the "Edit Globals" window of ircombine. Make sure the genlock
> loop on pipe 1 is terminated, and you should be set. If you are trying to
> genlock unusual formats, you could try genlocking 1280x1024_60 first to check
> that your cabling is correct, then move to the other format.
>
> > However, I have managed to crash two pipes (and recover)
> > with the following experiment...
> >
> > Setup a very small additional channel with ircombine, on
> > pipe zero to output sync on green. Then use that sync on
> > green as the pipe 1 genlock input.
> >
> > gfxinfo -v then says that we are genlocked. Pipe zero went
> > totally screwy when I tried to load a different cmb file - I
> > had to completely power down the onyx and power up - a reset
> > and/or reload of any cmb file wasn't enough :-(
>
> This is odd. You are only using pipe 0 for output. It should act normally as
> you change combinations. I can see that pipe 1 might have problems if you
> changed pipe 0's combination. Are you running the genlock cabling through pipe
> 0?
>
> Eric
> --
> Eric Kunze
> ekunze++at++engr.sgi.com
--Gary Quinn, VR Centre Technical Manager University of Teesside SG Network Admin Borough Road, Middlesbrough Go Player Cleveland, TS1 3BA mailto:Gary++at++tees.ac.uk +44 (0)1642 384303 fax 384310 http://vr.tees.ac.uk
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